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is not the same as Li An's idea, Li Longji pays more attention to the use of black powder for the military, but Li Longji also supports the use of black powder for mining mines, after all, in this way, the speed of mining will be greatly increased, and Datang has more metal materials to make more high-quality weapons.

However, unlike the strict organization of the army, the miners who open the mines are ordinary people, and the owners of the major mines are also from big families.

Regarding this possibility, Li Longji had to consider it, after all, the power of black powder was too great, and if someone hid it privately, it would definitely not be a good thing for the ruling class of the Tang Dynasty.

Therefore, how to ensure that all the black powder sold to the major nobles will be used for mining has become a major matter that must be considered.

Li Longji told Li Ang about his worries and asked Li Ang about countermeasures, he really wanted to hear Li An's thoughts, after all, Li An's brain is so smart, he believes that Li An will have a better way.

"Your Majesty, this is not difficult, you can tell the people of the whole world that those who dare to secretly hide black powder are equivalent to the crime of treason, in addition, Your Majesty can organize a special secret visit force to conduct secret visits to the entire territory of Datang, and timely discover those who secretly hide black powder, and severely punish them, so that naturally no one dares to hide them privately."

Li An's method is not foolproof, but it is already the best way, intimidation with a big crime, the people will obey, for example, the Tang Dynasty prohibits the people from collecting armor, otherwise it is equivalent to complicity in rebellion, as a result, almost all the people do not have armor in their homes, as long as the private possession of black powder is a felony, under normal circumstances, no one will dare to hide it privately, unless he really intends to rebel.

Li Longji nodded, which can be regarded as approving Li An's method, after all, he can't think of a better way, and it is imperative to use black powder to mine ore.

"Li Shilang, the formula of black powder, God knows that you know it, in addition, you must not let a third person know, and in order to prevent Fanbang from coveting the formula of black powder, I feel that it is necessary to protect Li Shilang's personal safety, tonight, I will send fifty Flying Dragon Forbidden Army to be stationed near Li Shilang's mansion."

Li Longji sent the most elite soldiers and horses to be placed next to Li An's mansion on the grounds of protecting Li An, and it was obvious that at this moment, Li An's personal safety had become extremely important, because the work related to black powder could not be separated from him, and he must not have any safety problems.

Although the taste of being watched is not very pleasant, Li An has no choice, what Li Longji has decided will never be changed easily, in addition, his security problem is no longer just his problem, but related to the lifeblood of the entire Tang Dynasty, and he must not be careless. 【】

"Your Majesty Xie cares, Weichen will go back to prepare, tomorrow afternoon, the drawings of the black powder workshop will be handed over to the Ministry of Industry, and half a month later, the black powder will be officially manufactured."

Li Ang accepted Li Longji's kindness, and besides, the matter has been almost over, and it is time to retire.

Li Longji nodded, and said softly: "Li Shilang is a rare talent in my Tang Dynasty, and now the task of implementing the two tax laws has been handed over to Guo Shilang, Li Shilang can do a good job in the black powder workshop wholeheartedly, and also, rest more, don't be too tired." ”

Being so cared about by the emperor of the current dynasty, Li An was suddenly a little flattered, and hurriedly said: "Your Majesty also has to take care of the dragon's body, and Weichen will retire." ”

After speaking, he slowly withdrew from the Zichen Palace, followed the path in the palace, and walked towards the gate of the Daming Palace.

When passing by the small garden next to the Xuanzheng Palace, Li An saw hundreds of craftsmen and guards busy cleaning up the scene that had been bombed, and it could be seen that the damage caused by the explosion was extremely amazing, and it took many people to clean up at the same time to complete, and in addition, the nearby damaged buildings also needed simple repairs.

Li An shook his head and passed by the busy crowd, all of which was caused by him, and the harm to the hundred and ten people could not live in peace.

"A-a-lang, A-a-lang."

Seeing that Li An finally came out, Zhao Liu hurriedly led the horse and ran over.

Li An smiled at the corner of his mouth, stepped on the war horse, and stretched out his hand: "Go, go home." ”

"Ah Lang, I was really scared to death in the palace just now, the century-old trees and well-made pavilions in the palace were blown up by me like this."

Zhao Liu looked a little apprehensive, after all, the location of the explosion was in the palace, in case something that should not be destroyed, the emperor would be in trouble as soon as he turned his face.

"It's an order issued by His Majesty, what do you have to be afraid of, next, the imperial court is going to build a workshop in the south of the city, Ah Lang is busy, and you have to worry more about the affairs of the other courtyard!"

Large-scale production of black powder must be a hard job, the most important thing is that this thing will explode when it is ignited, and the safety production work is extremely important, and there can be no mistakes, otherwise, the consequences will be unimaginable, so Li An must spend a lot of energy on it, especially before the workshop enters the right track, it is the most annoying and accident-prone stage.

"Ah Lang rest assured, the vegetables in the five hundred acres of greenhouses are about to grow, when the time comes, I will let Wang Ba lead a group of people into the city to sell, now the vegetables in the open air have not yet begun to grow, our greenhouse vegetables, will definitely be able to sell at a good price."

Zhao Liu said excitedly.

"Haha! That's good, I'm so hungry, go back to eat! ”

Li An slapped the horse's buttocks and accelerated towards the mansion.

Now, it has long been past the meal, and when Li An and Zhao Liu returned to the mansion, the meal had already been prepared for half an hour, and it had been heated many times.

Li An didn't come back for a long time, which made Yan Ruyu very worried, so that she stayed in the room and waited, no matter how Cao'er persuaded her, she just refused to eat.

"Madam, Ah Lang is back."

Cao'er smiled mischievously and turned to leave the bedroom.

"Husband, why did you come back so late, didn't you say that you would definitely come back before noon?"

Yan Ruyu hurriedly greeted Li An and helped Li An take off his coat.

At this time, it is winter, and the temperature outside is relatively cold, but there are many fireplaces in Ang Lee's main house, and the temperature is still very warm, so the temperature difference between indoor and outdoor is relatively large, and you must take off the outermost coat when you enter the house, otherwise, it will be hotter.

"Ruyu, why haven't you moved the food, aren't you hungry?"

Seeing that the food on the table did not move, Li An asked with concern.

"The husband didn't come back on time, how could Ruyu eat."

Yan Ruyu smiled and said delicately, seeing Li An come back at this moment, her heart was happier than anyone else.

"Madame cares so much, shouldn't she show it for her husband."

Li An smiled evilly, kept Yan Ruyu, and kissed her on the cheek.

"What are you doing in broad daylight! It's time to eat! ”

Yan Ruyu glanced at Ang Lee, and ate with Ang Lee, sandwiching the best meals into Ang Lee's bowl from time to time, making Ang Lee feel an indescribable warmth.

After eating and drinking, Li An immediately put into the work, the black powder factory is one of all the projects in Datang, the most important project, there must not be the slightest accident, especially the internal structure of the workshop must be reasonable, to fully consider all aspects of the situation, not only to pay attention to confidentiality, but also to pay attention to cost savings, reduce labor intensity, at the same time, but also pay special attention to safety, once a safety accident occurs, the consequences will be unimaginable.

In order to prevent a large-scale serial explosion, Li Ang had thought of many countermeasures before, including placing the manufactured black powder in an underground warehouse, so that in the event of an accident, the destructive power caused would be relatively limited.

In addition, several more underground warehouses should be built, and there should be enough distance between each two warehouses to ensure that an explosion in one of the warehouses will not affect the nearby warehouses, so as to avoid causing a series of explosions, so as to reduce losses as much as possible.

In addition, the workshop should store as many raw materials as possible, such as sulfur, saltpeter and charcoal powder, and other cover materials should also be prepared, and the finished black powder products should not be too much, so as to further reduce the safety risk, and when the large quantities are needed, various raw materials can be brought over, and a large number of finished black powder products can be produced quickly.

Sulphur powder, saltpeter powder and charcoal powder, Li An is going to let the three groups of people grind separately, and he must be personally responsible for the proportioning, but mixing these materials in large quantities is a hard work, and there must be corresponding mixing tools.

The best mixing tool in later generations is to manufacture a drum, load the material into the barrel, and then put the drum horizontally, roll back and forth, and the various materials inside will be fully mixed, so as to make the finished product, and after the finished product is done, the finished product can be poured out.

The manufacture of the drum was very simple, and Ang Lee drew a figure and prepared it for the craftsmen of the woodworking workshop to make it, and to make more of it, so as to prevent the production of black powder from being too tight and too late in time.

After drawing the dispensing drum, Ang Lee began to design various buildings of the black powder workshop, with several large workshops to be placed in the middle, the raw material warehouse on the left, the finished product warehouse on the right, and the dispensing workshop operated by Ang Lee himself at the back.

All the raw material warehouses are all above-ground structures, and the large workshop and the dispensing workshop are naturally on the ground, while the finished product warehouse on the right is all covered underground to prevent danger and lift the entire workshop away.

In addition, in terms of finished products, Li An is ready to adopt two packaging methods, the first is to be packed in a small clay pot, which is easier to manufacture and easy to prevent moisture, but it is relatively troublesome to carry, after all, clay pots are very heavy.

The second packaging method is to use linen packaging, which is much lighter than clay pots, and clay pots can only be cylindrical, while sacks can be packaged in a variety of shapes, such as easy-to-carry cuboids, just like the dynamite bags of later generations, but the moisture-proof aspect is a little worse.

Both of these manufacturing methods have their own advantages and disadvantages, you can make some of them together, look at the feedback of users, and then decide which one to produce.

After an hour of hard work, Li An has completely drawn the drawings of the black powder workshop, and the details of each part are clearly drawn, as long as the craftsmen of the Ministry of Industry read it, they can understand it, and besides, even if they can't understand it, it doesn't matter, Li An will often go over to inspect it, and he can give guidance at any time.

Of course, in addition to making black powder, Ang Lee also has a scientific research that must be carried out as soon as possible, that is, the railway system, first make simple rails and iron-wheeled carriages that can walk on them, and then rebuild them step by step, and finally invent a steam train that can be self-contained, of course, this is not easy, it requires a lot of effort, and it is not 100% possible.

Half an hour later, Ang Lee drew the drawings of the railroad tracks and the iron-wheeled carriages, and prepared for the craftsmen of the processing plant to start manufacturing them immediately.

By the time these drawings were completed, it was already dark, and Ang Lee's plan to get out of the city was completely out of play, so he could only go out of the city early the next morning.

At this time, ten miles outside the south gate of Chang'an City, a large number of torches lit up the sky, and hundreds of craftsmen from the Ministry of Industry and thousands of people requisitioned near Chang'an City were fighting at night to build a wall covering an area of more than 100 acres.

According to the standard given by Li Longji, the height of the wall must reach three zhang, the thickness must be one zhang, and the length of one circle is two miles, which can be regarded as a relatively large project.

In order to complete the project as soon as possible, the Ministry of Industry temporarily mobilized a large amount of manpower and material resources in Liaodong, and prepared to rush to work day and night to complete this task as quickly as possible.

The main reason why the Ministry of Industry is so active is that Li Longji issued a death order to let the Ministry of Industry go all out to build a black powder workshop, and for this reason, some projects in the palace can be stopped.

In order to show his serious attitude towards the construction of the black powder workshop and win the favor of the emperor, the squire of the Ministry of Works and several of his subordinates directly set up a tent and lived near the construction site, while the smaller officials of the Ministry of Industry rolled up their sleeves and went to work in person to encourage the craftsmen and people who worked.

Most of the city walls in this era of the Tang Dynasty were made of loess, and at most they were paved with a layer of stone bricks on the outermost part to make the city wall look better, and its main body was still loess.

And this is mainly because the materials of this era are relatively scarce, the technology is relatively backward, all the city walls are built with all stones, the cost is too high, and the time required is too long, and the loess is enough to defend against the enemy's attack as long as it is tamped and stronger.

It's just that later generations will always be deceived by various film and television dramas, thinking that the ancient city walls are built of stone, which is an absolute illusion, but only a small number of stone city walls can be preserved to future generations, so as to become a famous tourist attraction, and a large number of loess rammed city walls, after a thousand years, at most only a little poor foundation remains, and you can't see the appearance of the year at all.

Early in the morning of the second day, Li An finished breakfast, took several drawings, and together with Zhao Liu, rode his horse to the south of the city, but this time, behind them, there were more than a dozen soldiers of the Flying Dragon Forbidden Army following, and Li An knew that these people were there to protect him. (To be continued.) Mobile phone users, please browse and read, a better reading experience.